Method:
Heat a cast iron skillet, griddle, or double-sided sandwich maker. Spread mustard and mayonnaise on each piece of the bread. Layer 2 slices each of the ham, turkey, salami, and cheese onto 2 pieces of the bread. Layer even amounts of pickle between the meat and cheese. If desired, top each with even amounts of spinach, purple onion, and red pepper. Top each with a piece of bread to make two sandwiches. Place sandwiches on the hot skillet or griddle. (If desired, you can use a small amount of clarified butter on the grill). Lay a heavy skillet on top of the sandwich to flatten the it to about one-quarter of its original size, grilling for about 2 to 3 minutes on each side. If using a double-sided sandwich maker, grill for 3 to 4 minutes. Serve sandwiches hot.